tests/qtest: add PCA9555 register access tests
Introduce a qtest for the PCA9555 16-bit I/O port expander. This first set covers the power-on reset defaults and the read/write behaviour of the OUTPUT, CONFIG and POLARITY register pairs. Signed-off-by: Emmanuel Blot <emmanuel.blot@free.fr> Reviewed-by: Glenn Miles <milesg@linux.ibm.com> Link: https://lore.kernel.org/qemu-devel/20260709-catalina-upgrade-v1-10-814575bc076b@free.fr Signed-off-by: Cédric Le Goater <clg@redhat.com>
Emmanuel Blot committed
Jul 9, 2026 at 17:23 UTC
71aa15068ccaa8b330f4f324c33315557d54742c
2 files changed
+45
tests/qtest/meson.build
+1
@@ -319,6 +319,7 @@ qos_test_ss.add(
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'tulip-test.c',
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'nvme-test.c',
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'pca9552-test.c',
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+ 'pca9555-test.c',
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'pci-test.c',
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'pcnet-test.c',
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'rs5c372-test.c',
tests/qtest/pca9555-test.c
new
+44
@@ -0,0 +1,44 @@
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+/*
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+ * QTest testcase for the PCA9555 16-bit I/O port expander
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+ *
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+ * Copyright (c) Meta Platforms, Inc. and affiliates.
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+ *
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+ * SPDX-License-Identifier: GPL-2.0-or-later
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+ */
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+
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+#include "qemu/osdep.h"
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+#include "hw/gpio/pca9552_regs.h"
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+#include "libqos/i2c.h"
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+#include "libqos/qgraph.h"
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+
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+#define PCA9555_TEST_ADDR 0x20
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+
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+/* Verify power-on reset defaults match the PCA9555 datasheet. */
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+static void test_reset_defaults(void *obj, void *data, QGuestAllocator *alloc)
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+{
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+ QI2CDevice *dev = (QI2CDevice *)obj;
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+
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+ g_assert_cmphex(i2c_get8(dev, PCA9535_INPUT0), ==, 0xFF);
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+ g_assert_cmphex(i2c_get8(dev, PCA9535_INPUT1), ==, 0xFF);
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+ g_assert_cmphex(i2c_get8(dev, PCA9535_OUTPUT0), ==, 0xFF);
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+ g_assert_cmphex(i2c_get8(dev, PCA9535_OUTPUT1), ==, 0xFF);
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+ g_assert_cmphex(i2c_get8(dev, PCA9535_POLARITY0), ==, 0x00);
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+ g_assert_cmphex(i2c_get8(dev, PCA9535_POLARITY1), ==, 0x00);
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+ g_assert_cmphex(i2c_get8(dev, PCA9535_CONFIG0), ==, 0xFF);
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+ g_assert_cmphex(i2c_get8(dev, PCA9535_CONFIG1), ==, 0xFF);
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+}
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+
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+static void pca9555_register_nodes(void)
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+{
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+ QOSGraphEdgeOptions opts = {
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+ .extra_device_opts = "address=0x20"
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+ };
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+ add_qi2c_address(&opts, &(QI2CAddress) { PCA9555_TEST_ADDR });
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+
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+ qos_node_create_driver("pca9555", i2c_device_create);
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+ qos_node_consumes("pca9555", "i2c-bus", &opts);
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+
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+ qos_add_test("reset-defaults", "pca9555", test_reset_defaults, NULL);
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+}
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+
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+libqos_init(pca9555_register_nodes);